使用Spring 中RowMapper的增上改查操作方法

wuye_chinaunix

实现一、在内部建立内联类实现RowMapper接口  
package hysteria.contact.dao.impl;  
  
import java.sql.ResultSet;  
import java.sql.SQLException;  
import java.sql.Types;  
import java.util.List;  
  
import org.springframework.jdbc.core.JdbcTemplate;  
import org.springframework.jdbc.core.RowMapper;  
  
import hysteria.contact.dao.ItemDAO;  
import hysteria.contact.domain.Item;  
  
public class ItemDAOImpl implements ItemDAO {  
private JdbcTemplate jdbcTemplate;  
  
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {  
  this.jdbcTemplate = jdbcTemplate;  
}  
  
public Item insert(Item item) {  
  String sql = "INSERT INTO items(user_id,name,phone,email) VALUES(?,?,?,?)";  
  Object[] params = new Object[]{item.getUserId(),item.getName(),item.getPhone(),item.getEmail()};  
  int[] types = new int[]{Types.INTEGER,Types.VARCHAR,Types.CHAR,Types.VARCHAR};  
  jdbcTemplate.update(sql,params,types);  
  return item;  
}  
  
public Item update(Item item) {  
  String sql = "UPDATE items SET name = ?, phone = ?, email = ? WHERE id = ?";  
  Object[] params = new Object[] {item.getName(),item.getPhone(),item.getEmail(),item.getId()};  
  int[] types = new int[] {Types.VARCHAR,Types.CHAR,Types.VARCHAR,Types.VARCHAR,Types.INTEGER};  
  jdbcTemplate.update(sql,params,types);  
  
  return item;  
}  
  
public void delete(Item item) {  
  String sql = "DELETE FROM items WHERE id = ?";  
  Object[] params = new Object[] {item.getId()};  
  int[] types = new int[]{Types.INTEGER};  
  jdbcTemplate.update(sql,params,types);  
}  
  
public Item findById(int id) {  
  String sql = "SELECT * FROM items WHERE id = ?";  
  Object[] params = new Object[] {id};  
  int[] types = new int[] {Types.INTEGER};  
  List items = jdbcTemplate.query(sql,params,types,new ItemMapper());  
  if(items.isEmpty()){  
   return null;  
  }  
  return (Item)items.get(0);  
}  
  
public List findAll() {  
  String sql = "SELECT * FROM items";  
  return jdbcTemplate.query(sql,new ItemMapper());  
}  
  
  
public List findAllByUser(int user_id) {  
  String sql = "SELECT * FROM items WHERE user_id = ?";  
  Object[] params = new Object[]{user_id};  
  int[] types = new int[]{Types.INTEGER};  
  List items = jdbcTemplate.query(sql,params,types,new ItemMapper());  
  return items;  
}  
  
protected class ItemMapper implements RowMapper {  
  
  public Object mapRow(ResultSet rs, int rowNum) throws SQLException {  
   Item item = new Item();  
   item.setId(rs.getInt("id"));  
   item.setUserId(rs.getInt("user_id"));  
   item.setName(rs.getString("name"));  
   item.setPhone(rs.getString("phone"));  
   item.setEmail(rs.getString("email"));  
  
   return item;  
  }  
  
}  
  
  
}  
               
               
                       
               
               
               

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